Cass Art Artists' Watercolours are an extra fine, professional grade watercolour with a unique formula, produced from the purest of pigments. The colours come in larger tubes, 10ml as opposed to the traditional 5ml, giving you incredible value. This set also includes a series 4 Cerulean Blue, a popular colour for watercolour artists. The colours have un-paralleled colour strength, with the highest lightfastness and permanence ratings. Our Artists’ Watercolours are also available to buy individually in a rich, broad range of 28 colours in 10ml tubes, 18 of which are produced from single-pure pigments. Colours Included Titanium White Lemon Yellow Pyrrrole Yellow Deep Pyrrole Orange Vermillion Alzarin Crimson Ultramarine Blue Cerulean Blue (Series 4) Sap Green Yellow Ochre Burnt Sienna Payne's Grey Stocked in all our UK stores.